svn commit: r281315 - in stable: 10/sys/dev/cxgbe/tom 9/sys/dev/cxgbe/tom

[John Baldwin]

Author: jhb
Date: Thu Apr  9 17:56:25 2015
New Revision: 281315
URL: https://svnweb.freebsd.org/changeset/base/281315

Log:
  MFC 279892:
  Resize receive socket buffers that support autosizing when receiving
  TCP data via direct data placement.

Modified:
  stable/9/sys/dev/cxgbe/tom/t4_ddp.c
Directory Properties:
  stable/9/sys/   (props changed)
  stable/9/sys/dev/   (props changed)

Changes in other areas also in this revision:
Modified:
  stable/10/sys/dev/cxgbe/tom/t4_ddp.c
Directory Properties:
  stable/10/   (props changed)

Modified: stable/9/sys/dev/cxgbe/tom/t4_ddp.c
==============================================================================
--- stable/9/sys/dev/cxgbe/tom/t4_ddp.c Thu Apr  9 16:52:53 2015        
(r281314)
+++ stable/9/sys/dev/cxgbe/tom/t4_ddp.c Thu Apr  9 17:56:25 2015        
(r281315)
@@ -65,6 +65,13 @@ __FBSDID("$FreeBSD$");
 #include "common/t4_tcb.h"
 #include "tom/t4_tom.h"
 
+VNET_DECLARE(int, tcp_do_autorcvbuf);
+#define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf)
+VNET_DECLARE(int, tcp_autorcvbuf_inc);
+#define V_tcp_autorcvbuf_inc VNET(tcp_autorcvbuf_inc)
+VNET_DECLARE(int, tcp_autorcvbuf_max);
+#define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max)
+
 #define PPOD_SZ(n)     ((n) * sizeof(struct pagepod))
 #define PPOD_SIZE      (PPOD_SZ(1))
 
@@ -459,6 +466,21 @@ handle_ddp_data(struct toepcb *toep, __b
        else
                discourage_ddp(toep);
 
+       /* receive buffer autosize */
+       if (sb->sb_flags & SB_AUTOSIZE &&
+           V_tcp_do_autorcvbuf &&
+           sb->sb_hiwat < V_tcp_autorcvbuf_max &&
+           len > (sbspace(sb) / 8 * 7)) {
+               unsigned int hiwat = sb->sb_hiwat;
+               unsigned int newsize = min(hiwat + V_tcp_autorcvbuf_inc,
+                   V_tcp_autorcvbuf_max);
+
+               if (!sbreserve_locked(sb, newsize, so, NULL))
+                       sb->sb_flags &= ~SB_AUTOSIZE;
+               else
+                       toep->rx_credits += newsize - hiwat;
+       }
+
        KASSERT(toep->sb_cc >= sb->sb_cc,
            ("%s: sb %p has more data (%d) than last time (%d).",
            __func__, sb, sb->sb_cc, toep->sb_cc));
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